* internal/ethapi: add baseFee to RPCMarshalHeader

* internal/ethapi: add FeeCap, Tip and correct GasPrice to EIP-1559 RPCTransaction results

* core,eth,les,internal: add support for tip estimation in gas price oracle

* internal/ethapi,eth/gasprice: don't suggest tip larger than fee cap

* core/types,internal: use correct eip1559 terminology for json marshalling

* eth, internal/ethapi: fix rebase problems

* internal/ethapi: fix rpc name of basefee

* internal/ethapi: address review concerns

* core, eth, internal, les: simplify gasprice oracle (#25)

* core, eth, internal, les: simplify gasprice oracle

* eth/gasprice: fix typo

* internal/ethapi: minor tweak in tx args

* internal/ethapi: calculate basefee for pending block

* internal/ethapi: fix panic

* internal/ethapi, eth/tracers: simplify txargs ToMessage

* internal/ethapi: remove unused param

* core, eth, internal: fix regressions wrt effective gas price in the evm

* eth/gasprice: drop weird debug println

* internal/jsre/deps: hack in 1559 gas conversions into embedded web3

* internal/jsre/deps: hack basFee to decimal conversion

* internal/ethapi: init feecap and tipcap for legacy txs too

* eth, graphql, internal, les: fix gas price suggestion on all combos

* internal/jsre/deps: handle decimal tipcap and feecap

* eth, internal: minor review fixes

* graphql, internal: export max fee cap RPC endpoint

* internal/ethapi: fix crash in transaction_args

* internal/ethapi: minor refactor to make the code safer

Co-authored-by: Ryan Schneider <ryanleeschneider@gmail.com>
Co-authored-by: lightclient@protonmail.com <lightclient@protonmail.com>
Co-authored-by: gary rong <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>